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Improved surface mass balance closure in ocean hindcast simulations
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2022
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Source: Journal of Advances in Modeling Earth Systems, 14, e2021MS002888
[PDF-3.65 MB]
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Journal Title:Journal of Advances in Modeling Earth Systems
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Description:Forced global ocean/sea-ice hindcast simulations are subject to persistent surface mass flux estimation biases, for example, configurations with an explicit-free surface may not take into account the seasonal storage of water on land when constraining sea level. We present a physically motivated surface mass flux closure, that results in: reduced watermass drift from initialization; improved Atlantic meridional overturning cirulation intensity; and more realistic rates of ocean heat uptake, in simulations using global ocean/sea-ice/land (MOM6/SIS2/LM3) model configurations, forced with atmospheric reanalysis data. In addition to accounting for the land storage, the area-integrated subpolar-to-polar (40°–90°N/S) surface mass fluxes are constrained, using a climatological estimate derived from the the CMIP6 historical ensemble, which helps to further improve hindcast performance. Simulations using MERRA-2 and JRA55-do forcing, subject to identical hydrologic constraints, exhibit similar reductions in drift.
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Source:Journal of Advances in Modeling Earth Systems, 14, e2021MS002888
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Compliance:Submitted
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